Question

. In a class test (+ 3) marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question. (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores-5 marks in this test though she has got 7 correct answers. How many questions has she attempted incorrectly??​

Answer 1

Answer:

1) Radhika scored 12×3=36 marks.   as 3 marks are for correct answer

final score of radhika is 20.

she got 16 marks negative. as −2 marks are for incorrect answer

 therefore she made 216=8 incorrect answer.

2) Mohini scored 7×3=21 marks. as 3 marks are for correct answer

final score of radhika is −5.

she got 26 marks negative.   as −2 marks are for incorrect answer

therefore she made 226=13 incorrect answer.

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Answer 2

Answer:

1. Radhika attempted 8 questions incorrectly

2. Mohini attempted 13 questions incorrectly

Step-by-step explanation:

• No. of correct answers multiply by 3 (mark for right answer), look at the actual mark, find difference... Divide that difference by 2 (penalty for wrong answer), you got your answer...